Mazen Zaitoon, M.D.
Internal Medicine Physician · Valparaiso, IN
Mazen Zaitoon, M.D. is an internal medicine physician with a practice address in Valparaiso, Indiana, and NPI 1013280965, issued on Feb 22, 2012. Check the license (Indiana 01075647A, as entered in NPPES) on the Medical Licensing Board of Indiana; the Medicare figures below come from public CMS files.
- Name
- Mazen Zaitoon
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 01075647A IN
Self-reported in NPPES; status is on the state search - Practice location
- 85 East United States 6 Frontage, Valparaiso, IN 46383
- Phone
- (219) 983-8300
- Enumerated
- Feb 22, 2012
- Record last updated
- Oct 5, 2015 (not updated in 11 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20190820000065); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,109 in Indiana → Look up another NPI →
Verify Mazen Zaitoon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Licensing Board of Indiana
Search for license 01075647ACheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
81% fewer Medicare Part D claims than the average internal medicine physician in 2024
590 Medicare Part D claims for 292 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 50 claims were for opioids.
Most prescribed
- Cefdinir32 claims
- Atorvastatin Calcium27 claims
- Furosemide27 claims
- Amlodipine Besylate22 claims
- Doxycycline Hyclate20 claims
- Hydrocodone-Acetaminophen20 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 58.9 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $221.63
3 payments; by number, the most common kind was food and beverage; the largest payer was Zoll Services LLC (a/k/a Zoll LifeCor Corp). The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Platinum Hospitalists LLPLas Vegas, NV
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mazen Zaitoon among 2,109 internal medicine physician records in Indiana
Mazen Zaitoon, M.D. is one of 2,109 internal medicine physician records with a practice address in Indiana. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 65% of them.
- NPI issued2012 · 65% of these records are older, 33% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2011 · median 2005 among the 1,448 with a school on file
- Record last updated2015 · 43% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Indiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
27 internal medicine physician records list a practice address in Valparaiso
They are 27 of the 1,525 NPPES records with a practice address in Valparaiso, and 2,109 internal medicine physician records in Indiana.
All 2,109 in Indiana → Every provider in Valparaiso → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Robert Buynak, M.D.Valparaiso, IN 463831508977984
- Vijaya Chapala, MDValparaiso, IN 463831174573281
- Thomas Devine, MDValparaiso, IN 463831942204508
- Jeffrey Gatz, MDValparaiso, IN 463831609868207
- Abdus Lakhani, MDValparaiso, IN 463831831187244
- Eugene Lin, MDValparaiso, IN 463831972595726
- Ruolan Pi, MDValparaiso, IN 463831538152103
- Rajat Prakash, MDValparaiso, IN 463831700872041
Common questions
What is Mazen Zaitoon, M.D.'s NPI number?
Mazen Zaitoon, M.D.'s National Provider Identifier (NPI) is 1013280965, issued on Feb 22, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Mazen Zaitoon, M.D. located?
The NPPES record lists a practice address at 85 East United States 6 Frontage, Valparaiso, IN, 46383. Phone: (219) 983-8300. Providers update this record themselves, so call before visiting.
How can I verify Mazen Zaitoon, M.D.'s license?
NPPES lists Indiana license number 01075647A, as entered by the provider. Search the Medical Licensing Board of Indiana at https://www.in.gov/pla/professions/physicians-home/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mazen Zaitoon, M.D. prescribe under Medicare Part D?
In 2024, Mazen Zaitoon, M.D. had 590 Medicare Part D claims for 292 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Mazen Zaitoon, M.D.'s MIPS final score?
The 2023 MIPS final score is 58.9 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.